02、python的基础-->占位符、while...else...、逻辑运算符

1、%s、%d格式化输出程序(%占位符，s字符串，d数字)

name = input('请输入姓名：')
age = input('请输入年龄：')
job = input('请输入工作：')
hobbie = input ('你的爱好：')
msg ='''--------------info of %s--------------
Name : %s
Age : %d
Job : %s
Hobbie : %s
--------------end--------------''' % (name,name,int(age),job,hobbie)
print(msg)

注：如果单纯的想在格式化输出%，需要用2个%，如：30%%即可。

2、while...else 的使用

count = 0
while count <= 5 :
    count += 1
    if count == 3:break    #当程序遇到break，自动跳出循环
    print("Loop",count)
else:
    print("循环正常执行完啦")
print("-----out of while loop ------")

3、逻辑运算符

#and or not
#优先级，（）> not > and > or
print(2 > 1 and 1 < 4)
print(2 > 1 and 1 < 4 or 2 < 3 and 9 > 6 or 2 < 4 and 3 < 2)
T or T or F
T or F
print(3>4 or 4<3 and 1==1)  # F
print(1 < 2 and 3 < 4 or 1>2)  # T
print(2 > 1 and 3 < 4 or 4 > 5 and 2 < 1)  # T
print(1 > 2 and 3 < 4 or 4 > 5 and 2 > 1 or 9 < 8)  # F
print(1 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6)  # F
print(not 2 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6) # F

#ps  int  ----> bool   非零转换成bool True   0 转换成bool 是False
print(bool(2))
print(bool(-2))
print(bool(0))
#bool --->int
print(int(True))   # 1
print(int(False))  # 0


'''x or y x True，则返回x'''
print(1 or 2)  # 1
print(3 or 2)  # 3
print(0 or 2)  # 2
print(0 or 100)  # 100


print(2 or 100 or 3 or 4)  # 2

print(0 or 4 and 3 or 2)  #3

注：and跟or运算结果相反

4、面试题

'''x and y x True，则返回y'''
print(1 and 2)  # 2
print(0 and 2)  # 0
print(2 or 1 < 3)  # 2
print(3 > 1 or 2 and 2)  # Ture